<template>
    <!-- 侧边导航栏 -->
   <el-menu default-active="1-4-1" 
      class="el-menu-vertical-demo" 
      @open="handleOpen" 
      @close="handleClose" 
      :collapse="isCollapse"
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b">
      <h3>{{isCollapse ? '米羊':'米羊后台管理系统' }}</h3>
        <!-- 1.首页、商品管理、用户管理 -->
        <el-menu-item @click = "clickMenu(item)" v-for = "item in noChildren" :key = "item.name" :index="item.name">
            <i :class="`el-icon-${item.icon}`"></i>
            <span slot="title">{{item.label}}</span>
        </el-menu-item>
        <!-- 2.其他 -->
        <el-submenu v-for = "item in hasChildren" :key = "item.label" :index="item.label">
            <template slot="title">
                <i :class="`el-icon-${item.icon}`"></i>
                <span slot="title">{{item.label}}</span>
            </template>
           <!-- 2.1选项 -->
            <el-menu-item-group v-for = "subItem in item.children" :key="subItem.path" >
                <el-menu-item @click = "clickMenu(subItem)" index="subItem.path">{{subItem.label}}</el-menu-item>
            </el-menu-item-group>
        </el-submenu>
       
    </el-menu>
</template>


<script>
import Cookie from "js-cookie"
  export default {
    data() {
      return {}
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      },
      //点击菜单
      clickMenu(item){
        //跳转路由
        //当页面路由与跳转路由不一致才允许跳转
        if(this.$route.path !== item.path && !(this.$route.path==='/home' && (item.path ==='/'))){
          this.$router.push(item.path)
        }
        this.$store.commit('selectMenu',item)
      }
    },
    computed:{
        //没有子菜单
        noChildren(){
           return this.menuData.filter(item => !item.children)
        },
        //有子菜单
        hasChildren(){
            return this.menuData.filter(item => item.children)
        },
        menuData(){ 
          //判断当前数据，如果缓存中没有，当前store中去获取
         return JSON.parse(Cookie.get('menu')) || this.$store.state.tab.menu
         
        },
        isCollapse(){
          return this.$store.state.tab.isCollapse
        }
    }
  };
</script>
<style lang="less" scoped>
  .el-menu {
    border-right: none;
  }
</style>

<style lang="less" scoped>
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
  .el-menu {
    height: 100vh;
    h3{
      color: #fff;
      text-align: center;
      line-height: 48px;
      font-size: 16px;
      font-weight: 400;
    }
  }
</style>